Nozzle jamming? Failed adhesion to print bed?

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Trying to figure out what the heck is going on with my UM2. I've had several great prints, then for the last week or so, every time I try to print, I get results like these...

The printer head is clean, as is the print bed. I've tried 210/60, 215/60, 220/60, 210/70, 205/60, all with the same results. I've tried different filaments (Ultimaker silver, Colorfabb black, Colorfabb gray), all with the same results. I've tried printing on blue tape and without blue tape but with stick glue on the bed. Same results.

The damning thing is that I occasionally get good prints, then this happens several times in a row. Nothing seems consistent about this, and it's driving me mad.

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How many hours did you print all in all until this started? I had similar under extrusion when my PTFE coupler was "used up". The effect was that the feeder couldn't push the filament anymore to the heating zone because the PTFE coupler had lost its stability and was bulging into the filament path under the pressure of the hot end spring. Depending on the temperature you print, this can happen after a few 100 hours already.

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Dim3nsioneer - Layer height is right at 0.1 mm. I've done a few atomic pulls. I just don't get why it's working fine for the first few passes for the brim but falls apart shortly after that (or well after, in the case of the second picture when I tried to print 3 of those items at once).

I cleaned the nozzle off with a wire brush so there shouldn't be any issue with debris or filament coating the nozzle. I had printed a wiper for the filament before it goes through the feeder, though I took it out to reduce factors that could be causing this issue.

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Glad to hear you fixed it. It has happened to me twice. That is burned filament and as you now realise doing a few atomic pulls does not shift it. I have done atomic pulls and not seen anything on the filament but it still comes out again. I have no idea why you can print for 30 minutes and then out it comes again. It was this experience that led me to putting the extruder and nozzle into boiling water and poking around with a small screwdriver and toothpick unit I was sure there was nothing left. If I recall correctly it was jammed around the screw thread in the extruder and not visible without looking really carefully.

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